This is the next blog post in a series where I’m explaining how and what I did to.. well do less.. at least when it comes to watering the plants :)

This time, I finally make use of the weather station I build a couple of months ago. But I wanted to take it a couple of steps further. I wanted to build a system that is watering the plants automagically, based on temperature and whether or not it rained on that day.

After I put some thoughts into how I’d actually water the plants, I was pretty convinced, I…


This is a follow up on this article: => Click.

A couple of weeks after I build the temperature and rain sensor, I’m now coming back to this with quite some improvements, which I’d like to share with you.

The rain sensor only worked for like 1 1/2 months. Due to the current flow and the contact with water, the rain sensor built rust from electrolysis that damages the sensor. There are a couple of things one could do about it. The best way probably would be to complete turn off the sensor while not measuring. However, this would mean…


In the not too distant future, my daughter will be born. Of course, in the first months, she will sleep next to our bed. As my wife needs to feed the baby in the night, we were searching for a night light. It should be super simple. Just a button to turn on the light, best would be red light. However most of the night lights that you can buy either are very expensive or they have motion sensors or some fancy stuff that you don’t need.

After some time I decided to build a super simple night light myself…


Beware, there’s a follow up on this article.

— — — —

My wife likes to grow her own vegetables on our balcony. The problem with this however is, that one also needs to water the plants (first world problems right?)

As the tech guy I am, I was going a little bit wild last summer and build a Homekit enabled solution to water the plants. Every day at 8 in the morning and 7 in the evening, it was watering the plants for a couple of minutes.

It works great, but the system was not aware of the temperature…

Christian Kellner

Working @Instana, Loving tech {...life}

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store